Hows this for a music machine

[Audio Al]

[YT]https://www.youtube.com/watch?v=IvUU8joBb1Q/YT]

[ReggieB]

Rather splendid - though they look like ball bearings to me rather than marbles.

[Gordon Steadman]

He's obviously been watching Animusic. That's done in software but this is a nice bit of engineering!!

https://www.youtube.com/watch?v=Xu-A0jqMPd8